I figure Aaron can help me here? There's so much good info on this board, but I have to ask a question... I've been looking for a 17" or 18" wheel/tire combo for my '97 328iS I just got. It's a lease, so I'm leaving it at stock height. I still can't decide if I want to step up to 18's, but it seems the Loco 150's would be the cheapest way to do so. With 225/40 18's, how much taller/smaller would they be than the stock 205/60 15's (speedometer, odometer-wise)? And if I decided instead to go with 17's (and if Tire Rack still has any Fittipaldi AV3's left) would the correct size be 235/40 17? Thanks for any help...